Buzzer-transmitter.



V J. P. FERRITER..

BUZZER TRANSMITTER,

APPLICATION HLED SEPT-20, 191s.

. 1,234,650; I Patnted Jul 24, 1917.

WITNESSES IN VENTOR c/fi/rrafyr U N" ITED STATES PATEN OFFICE.

JOHN PATRICK FERRITER, OF JACKSONVILLE, FLORIDA, ASSIGNOR OF ONE-HALF TO THOMAS J. PETERS, 0F PETERS, FLORIDA.

BUZZER-TRANSMITTER.

Specification of Letters Patent.

Patented July 24, 1917.

To all whom it may concern:

Be it known that I, JOHN P. FERRITER, a citizen of the United States, and a resident of J acksonsville, in the county of Duval and State of Florida, have invented a new and Improved Buzzer-Transmitter, of which the following is a full, clear, and exact description.

This invention relates to transmitters, and more especially to a buzzer transmitter.

The object of the invention is to provide a buzzer transmitter for the purpose of telegraphing over a wire telephone circuit or for use as a telegraph transmitter over a wireless telephone circuit, or for use as a telegraph transmitter in induction telegraph devices designed to operate on telegraph or telephone wires to provide an additional telegraph circuit over such wires, or for use as a telegraph transmitter wherever a high frequency alternating current is required and when the requirements include the elimination of brush discharges.

The main objection to ordinary buzzer transmitters or induction coils for telegraphic purposes is their tendency to give off a brush discharge which is hard to control and which passes through the air to nearby coils or from wire to wire, causing cross signals on adjacent circuits and also making it impossible to duplex a buzz.

For a more complete understanding of the invention reference is to be had to the following description and claims taken in connection with the accompanying drawing, in which The figure is a diagrammatic view of the transmitter.

Referring to the drawing, the buzzer is shown as consisting of an actuating coil A which is inclosed in an open-ended metal tube B, preferably of brass or copper, and at one end of the coil is an interrupter C, and at the opposite end a microphonic transmitter D. The buzzer transmitter is so constructed as to eliminate the brush discharge, and consequently the transmitter is made with the coil, long and slender, approximately siX inches long, with a magnetic core 1 about one-half inch in diameter, and a winding 2 of about five layers of insulated copper wire of number 23 B. & S. gage.

' The metal tube B absorbs the brush discharges and is preferably made of brass or copper, although the invention is not limited in this respect.

The interrupter C is of usual construction including a vibrating contact 3 and an adjustable contact 4, which latter is connected with one end of the winding 2. The other end of the winding leads to a binding post 5, while the contact 3 is connected by a wire 6 with a binding post 7 whereby the buzzer transmitter may be connected with a battery circuit which includes a sending switch or equivalent make and break device. The microphonic transmitter D embodies spaced plates or electrodes 8 and 9 between which is granular conducting material .10, the plates being connected by wires 11 and 12 with binding posts 13 and 14 of a telephone circuit. Rigidly attached to one of the electrodes of the transmitter D is an armature 15 spaced from the end of the coil A a suitable distance but lying within the magnetic field thereof. The adjustment of the armature is such that it will vibrate in resonance with the magnetic vibrations set up in the coil of the core A when the interrupter C is in operation, but the armature 15 does not come into contact with the core. The vibration of the armature 15 being communicated with the microphonic transmitter D throws the latter into vibration and sends the signals to the line, asin an ordinary telephone circuit.

From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily understood by those skilled in the art to which the invention appertains, and while I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made when desired as fall within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by-Letters Patent:

1. A buzzer transmitter comprising a long, slender coil, a metal tube inclosing the same, an interrupter in thecircuit of the coil and arranged at one end thereof, and a microphonic transmitter at the opposite end of the coil and including an armature adjacent to and out of contact with the core contacting relation with the core of the coil, of the coil. spaced electrodes, oneof which. is connected 2. A buzzer transmitter comprising a with the armature, granular particles be- 10 long, slender coil, means surrounding the tween the electrodes, and circuit Wires concoil for absorbing the brush discharges, an nected With the electrodes. interrupter actuated by and in circuit with the coil, an armature adjacent to and out of JOHN PATRICK FERRITER.

, flopiesipf this patent maybe obtained for five cents each, by addressing the Commissioner of latents,

7 Washington, D. G. 

